// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/pepper/pepper_platform_camera_device.h"

#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "content/renderer/media/video_capture_impl_manager.h"
#include "content/renderer/pepper/gfx_conversion.h"
#include "content/renderer/pepper/pepper_camera_device_host.h"
#include "content/renderer/pepper/pepper_media_device_manager.h"
#include "content/renderer/render_frame_impl.h"
#include "content/renderer/render_thread_impl.h"
#include "media/base/bind_to_current_loop.h"
#include "url/gurl.h"

namespace content {

PepperPlatformCameraDevice::PepperPlatformCameraDevice(
    int render_frame_id,
    const std::string& device_id,
    const GURL& document_url,
    PepperCameraDeviceHost* handler)
    : render_frame_id_(render_frame_id)
    , device_id_(device_id)
    , session_id_(0)
    , handler_(handler)
    , pending_open_device_(false)
    , pending_open_device_id_(-1)
    , weak_factory_(this)
{
    // We need to open the device and obtain the label and session ID before
    // initializing.
    PepperMediaDeviceManager* const device_manager = GetMediaDeviceManager();
    if (device_manager) {
        pending_open_device_id_ = device_manager->OpenDevice(
            PP_DEVICETYPE_DEV_VIDEOCAPTURE, device_id, document_url,
            base::Bind(&PepperPlatformCameraDevice::OnDeviceOpened,
                weak_factory_.GetWeakPtr()));
        pending_open_device_ = true;
    }
}

void PepperPlatformCameraDevice::GetSupportedVideoCaptureFormats()
{
    DCHECK(thread_checker_.CalledOnValidThread());
    VideoCaptureImplManager* manager = RenderThreadImpl::current()->video_capture_impl_manager();
    manager->GetDeviceSupportedFormats(
        session_id_,
        media::BindToCurrentLoop(base::Bind(
            &PepperPlatformCameraDevice::OnDeviceSupportedFormatsEnumerated,
            weak_factory_.GetWeakPtr())));
}

void PepperPlatformCameraDevice::DetachEventHandler()
{
    DCHECK(thread_checker_.CalledOnValidThread());
    handler_ = NULL;
    if (!release_device_cb_.is_null()) {
        base::ResetAndReturn(&release_device_cb_).Run();
    }
    if (!label_.empty()) {
        PepperMediaDeviceManager* const device_manager = GetMediaDeviceManager();
        if (device_manager)
            device_manager->CloseDevice(label_);
        label_.clear();
    }
    if (pending_open_device_) {
        PepperMediaDeviceManager* const device_manager = GetMediaDeviceManager();
        if (device_manager)
            device_manager->CancelOpenDevice(pending_open_device_id_);
        pending_open_device_ = false;
        pending_open_device_id_ = -1;
    }
}

PepperPlatformCameraDevice::~PepperPlatformCameraDevice()
{
    DCHECK(thread_checker_.CalledOnValidThread());
    DCHECK(release_device_cb_.is_null());
    DCHECK(label_.empty());
    DCHECK(!pending_open_device_);
}

void PepperPlatformCameraDevice::OnDeviceOpened(int request_id,
    bool succeeded,
    const std::string& label)
{
    DCHECK(thread_checker_.CalledOnValidThread());
    DCHECK(handler_);

    pending_open_device_ = false;
    pending_open_device_id_ = -1;

    PepperMediaDeviceManager* const device_manager = GetMediaDeviceManager();
    succeeded = succeeded && device_manager;
    if (succeeded) {
        label_ = label;
        session_id_ = device_manager->GetSessionID(PP_DEVICETYPE_DEV_VIDEOCAPTURE, label);
        VideoCaptureImplManager* manager = RenderThreadImpl::current()->video_capture_impl_manager();
        release_device_cb_ = manager->UseDevice(session_id_);
    }

    handler_->OnInitialized(succeeded);
}

void PepperPlatformCameraDevice::OnDeviceSupportedFormatsEnumerated(
    const media::VideoCaptureFormats& formats)
{
    DCHECK(thread_checker_.CalledOnValidThread());
    DCHECK(handler_);

    std::vector<PP_VideoCaptureFormat> output_formats;
    for (const auto& format : formats) {
        PP_VideoCaptureFormat output_format;
        output_format.frame_size = PP_FromGfxSize(format.frame_size);
        output_format.frame_rate = format.frame_rate;
        output_formats.push_back(output_format);
    }
    handler_->OnVideoCaptureFormatsEnumerated(output_formats);
}

PepperMediaDeviceManager* PepperPlatformCameraDevice::GetMediaDeviceManager()
{
    RenderFrameImpl* const render_frame = RenderFrameImpl::FromRoutingID(render_frame_id_);
    return render_frame
        ? PepperMediaDeviceManager::GetForRenderFrame(render_frame).get()
        : NULL;
}

} // namespace content
